August 2024

• Guiseppe Mazzuoccolo, UNIMORE Università degli Studi die Modena e Reggio Emilia, Modena, Italy

February/March 2024

• Dr Ligang Jin, Zhejiang Normal University, School of Mathematical Sciences, China
• Dr Yingli Kang, Department of Mathematics, Jinhua Polytechnic, China

March 2023

• Davide Mattiolo, KU Leuven Kulak, Kortrijk, Belgium

February 2023

• Edita Máčajová, Comenius University Bratislava, Slovakia

November 2019

• Riste Škrekovski, University of Ljubljana, Slovenia

September - December 2019

• Davide Mattiolo, University of Modena and Reggio Emilia, Italy

November 2018

• Imran Allie, University of the Western Cape, Cape Town, South Africa

May 2018

• Cun-Quang Zhang, West Virginia University, Morgantown, USA

February 2018

• Michael Stiebitz, TU Ilmenau

November 2017

• Cun-Quang Zhang, West Virginia University, Morgantown, USA

February 2017

• Miguel A. Fiol, Universitat Politècnica de Catalunya, Barcelona, Spain

October 2016

• Edita Rollová, University of West Bohemia, Pilsen, Czech Republic

October 2015

• Edita Rollová, University of West Bohemia, Pilsen, Czech Republic

November 2014

• Ingo Schiermeyer, Institute for Discrete Mathematics & Algebra, Freiberg University of Mining and Technology

• Guiseppe Mazzuoccolo, UNIMORE Università degli Studi die Modena e Reggio Emilia, Modena, Italy

• Gabriel Semanisin, P.J. Šafarik University Košice, Slovakia

January - February 2014

• Edita Rollová, University of West Bohemia, Pilsen, Czech Republic

March - May 2013

• Barbora Candráková, Comenius University Bratislava, Slovakia

June 2012

• Xuding Zhu, Zheijang Normal University, Jinhua, China